[AG-TECH] Echo canceller

Osland, CD (Chris) C.D.Osland at rl.ac.uk
Thu Jul 17 17:52:29 CDT 2003

Do all you can to get the money for the Gentner.  The AP 800
cost us about 1.5 times the cost of a single projector, so I
guess the XAP 800 would be about 2 times.

Well worth it.

Realise that to a first approximation if you have poor echo
cancellation - e.g. on a whole room basis, not mic by mic,
the only people who will not be inconvenienced are yourselves -
everyone else in every meeting you're in will bear the grief!

The Gentner is 

1.  a set of mic preamps, c/w EQ etc..
2.  a full set of gates for the same
3.  a set of compressors/limiters/expanders for the same
4.  a full matrix mixer - way more outputs than a standard mixer
5.  oh, and an echo canceller and noise reducer as well

I've looked at many ways of doing the same thing, and the Gentner
is cheap by comparison.

Just my 0.02


Chris Osland                                               Office tel: +44
(0) 1235 446565
Digital Media and Access Grid                          Medialab tel: +44 (0)
1235 446459
BIT Department                                     Access Grid room tel: +44
(0) 1235 445666
e-mail:   C.D.Osland at rl.ac.uk                                       Fax: +44
(0) 1235 445597
CLRC Rutherford Appleton Laboratory (Bldg. R18)
Chilton, DIDCOT, Oxon OX11 0QX, UK
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> -----Original Message-----
> From: Richard Naylor [mailto:richard.naylor at citylink.co.nz]
> Sent: 17 July 2003 14:01
> To: ag-tech at mcs.anl.gov
> Subject: [AG-TECH] Echo canceller
> Hello,
> I probably should lurk a little longer on the list before asking a 
> question, but .......
> I have the task of building 3 AG nodes for NZ universities. 
> As usual budget 
> is tight. The Genter (or ClearOne) AEC device is expensive down here 
> NZ$12k. which looks like being twice the price of a projector.
> My question is, can I use a single channel AEC device like 
> the Polycom 
> EF2210 with a "standard" audio mixer in front of it. It does 
> mean that a 
> node operator will have to set audio levels on the mixer, but 
> that should 
> be standard room set up anyway.
> Apart from cost savings, using a mixer means I can easily 
> interface other 
> audio sources, for artistic sessions etc.
> Rich
> Technical Director
> CityLink

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